eFlightWatt is a wattmeter, a data logger, an ESC programmer, and a battery tester in one compact package. It can work in autonomous, "off-line", mode to record the data in flight as well as in "on-line" mode while connected to a computer via a USB cable. In on-line mode, it permits controlling and programming an ESC from the computer as well as testing a battery by discharging it with a constant current.

Up to 10S input voltage, 10...60A current range, up to 100,000 RPM tacho, two temperatures from 32F to 257F (0 to 125°C) with 0.2F (0.1°C) resolution